--  @testpoint:opengauss关键字query(非保留)，作为函数名

--关键字不带引号-成功
drop function if exists query;
create function query(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function query;
--关键字带双引号-成功
drop function if exists "query";
create function "query"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function "query";
--关键字带单引号-合理报错
drop function if exists 'query';
create function 'query'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带反引号-合理报错
drop function if exists `query`;
create function `query`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/